Examine source code of Kemono Friends

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Kemono Friends",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(7, 50, 84, 0)",
      "toolbar_text": "rgb(67, 194, 218)",
      "frame": "rgb(14, 41, 65)",
      "tab_background_text": "rgb(244, 249, 250)",
      "toolbar_field": "rgba(38, 72, 102, 0)",
      "toolbar_field_text": "rgb(67, 194, 218)",
      "tab_line": "rgb(67, 194, 218)",
      "popup": "rgb(205, 209, 214)",
      "popup_text": "rgb(3, 86, 101)",
      "tab_loading": "rgb(67, 194, 218)"
    }
  }
}